Calorimetric measurement of the heat of adsorption of benzene on Pt(111)

被引：125

作者：

Ihm, H ^{[1
]}

Ajo, HM ^{[1
]}

Gottfried, JM ^{[1
]}

Bera, P ^{[1
]}

Campbell, CT ^{[1
]}

机构：

[1] Univ Washington, Dept Chem, Seattle, WA 98195 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2004年 / 108卷 / 38期

关键词：

D O I：

10.1021/jp040159o

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The heat of adsorption of benzene on clean Pt(111) at 300 K is measured calorimetrically and found to decrease with coverage (theta) as (197 - 48theta - 83theta(2)) kJ/mol. Saturation coverage (theta = 1.0) is 2.3 x 10(14) molecules/cm(2). Sticking probabilities of benzene on Pt(111) were measured by mass spectrometry, giving an initial value of 0.97 and showing Kisliuk-type behavior with increasing coverage that implies there is a precursor to sticking with a ratio of its hopping rate to its desorption rate of similar to28. Benzene adsorbs transiently on the benzene-saturated surface at 300 K with a trapping probability of 0.90 and a heat of adsorption of 63-73 kJ/mol.

引用

收藏

页码：14627 / 14633

页数：7

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